configuring active data guard oracle 11g

In this blog we'll see how to configure 11g Data Guard using active dataguard i.e. standby database will be created from running primary. Steps to configure Oracle 11g Data Guard Physical Standby – Active Data Guard Part-I. Here in this article I am going to cover steps by step. Steps to configure Oracle 11g Data Guard Physical Standby – Active Data Guard Part-I Published 3 years ago by Jignesh Jethwa Here in this. This article is a repeat of the manual 11gR2 Data Guard setup described here, Flashback Database; Read-Only Standby and Active Data Guard; Snapshot Standby Data Guard Physical Standby Setup in Oracle Database 11g Release 2. configuring active data guard oracle 11g

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BRISTOL JEWELLERY AUCTION AUSTRALIA DB File Configuring active data guard oracle 11g Read. Make the observer highly available by using Oracle Enterprise Manager to configure the original primary database to be automatically reinstated as a standby database when a connection to the database is reestablished. Multi-site protection, including topology with local zero data loss standby for HA and remote asynchronous standby for geographic disaster recovery for Oracle Database. Assume we have three redo log group. With Data Guard the process of failover can be completely automated using fast-start failover or it can be a manual, user driven process. To maintain availability in cases where the primary database is operational but the standby database is not, the best practice is to always have a minimum of two synchronous standby databases in a Maximum Protection configuration. The primary database instances archive remotely to only one apply instance.
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The proper configuration of Oracle Data Guard is essential to ensuring that all standby databases work properly and perform their roles within the necessary service levels after switchovers configuring active data guard oracle 11g failovers. Data Guard is the Oracle optimized solution for Data availability and protection. It configuring active data guard oracle 11g at simple, fast, and reliable one-way replication of a complete Oracle Database to provide High Availability and Disaster Recovery.

Data Guard offers various deployment options that address unplanned outages, pre-production testing, and planned maintenance. Active Data Guard, an extension of basic Data Guard capabilities, further enables production offload of read-only workload to a synchronized physical standby database, automatic repair of corrupt blocks, and offload of fast incremental backups.

Data Guard design principles are simplicity, high performance, and application transparency. Data Guard is not intended to be a full-featured replication solution. Oracle GoldenGate is the solution recommended for advanced replication requirements, such as multi-master replication, granular replication of a subset of a database, many to one replication topologies, and data integration.

Oracle GoldenGate also provides additional options for reducing downtime for planned maintenance and for heterogeneous platform migrations.

Depending upon your requirements, the most efficient solution to use may be using Data Guard alone, using Data Guard with Oracle GoldenGate in a complementary manner, or just using Oracle GoldenGate. Table provides a summary of the Data Guard deployment options that are appropriate, depending on your requirements. Two or more options may be used in combination to address multiple requirements.

This chapter also presents the Best practices for implementing each option. Multi-site protection, including topology with local zero data loss standby for HA and remote asynchronous standby for geographic disaster recovery for Oracle Database.

Offload read-only queries and fast incremental backups to a synchronized standby database. Use the standby database to automatically repair corrupt blocks, transparent to the application and configuring active data guard oracle 11g. Active Data Guard. Active Data Guard can be purchased in either of the following ways: Snapshot Standby. A snapshot standby is easily converted back into a synchronized standby database when testing is complete.

Planned maintenance: Data Guard switchover, planned role transition, using Redo Apply. Oracle Database High Availability Overview for a description of the high availability solutions and benefits provided by Oracle Data Guard and standby databases. Oracle Data Guard Zero Data Loss protection provides both a guarantee of that data is protected and the simplest recovery. While both modes use Oracle Data Guard synchronous redo transport by default, there are differences in the rule-sets used to govern behavior at failover time that must be considered, as described below.

Oracle Data Guard synchronous redo transport, however, can impact primary database performance if round-trip network latency between primary and standby databases is too great latency is a function of distance and how 'clean' the network is.

If this is the case testing is easy to do, a DBA may change protection modes and transport methods configuring active data guard oracle 11gthen use Oracle Data Guard Maximum Performance.

Maximum Performance uses Oracle Data Guard asynchronous transport services and does not have any impact on primary database performance regardless of network latency. In an environment with sufficient bandwidth to accommodate redo volume, data loss potential is measured in single-digit seconds when using Maximum Performance.

To determine the configuring active data guard oracle 11g data protection mode for your application, consult Oracle Data Guard Concepts and Administration. Maximum Protection mode guarantees that no data loss will occur if the primary database fails, even in the case of multiple failures for example, the network between the primary and standby fails, and then at a later time, the primary fails. This is enforced by never signaling commit success for a primary database transaction until at least one synchronous Data Guard standby has acknowledged that redo has been hardened to disk.

Without such an acknowledgment the primary database will stall and eventually shut down rather than allow unprotected transactions to commit. To maintain availability in cases where the primary database is operational but the standby database is not, the best practice is to always have a minimum of two synchronous standby databases in a Maximum Protection configuring active data guard oracle 11g. Primary database availability is not impacted if it receives acknowledgment from at least one synchronous standby database.

Maximum Availability mode guarantees that no data loss will occur in cases where the primary database experiences the first failure to impact the configuration. Primary database availability thus the name of the protection mode is not impacted by an inability to communicate with the standby for example, due to standby or network outages.

Oracle Data Guard will continue to ping the standby and automatically re-establish connection and resynchronize the standby database when possible, but during the period when primary and standby have diverged there will be data loss should a second failure apostila concurso tj sc the primary database.

For this reason, it is a best practice to monitor protection level simple to do using Enterprise Manager Grid Control configuring active data guard oracle 11g quickly resolve any disruption in communication between primary and standby before a second failure can occur.

Maximum Performance mode the default mode provides the highest level of data protection that is possible without affecting the performance or the availability of the primary database. This is accomplished by allowing a transaction to commit as soon as the redo data needed to recover that transaction is written to the local online redo log at the primary database the same behavior as if there were no standby database. Oracle Data Guard transmits redo to the standby database directly from the primary log buffer asynchronous to the local online redo log write.

There is never any wait for standby acknowledgment. Similar to Maximum Availability, it is a best practice to monitor protection level simple to do using Enterprise Manager Grid Control and quickly resolve any disruption in communication between primary and standby before a second failure can occur. At a configuring active data guard oracle 11g level, the Redo Transport best practices for planning and implementing redo transport services for Oracle Data Guard are as follows:.

Use the SYNC redo transport mode for a high degree of synchronization between the primary and standby databases. Use SYNC redo transport for zero data loss protection where performance service levels can tolerate the impact caused by network latency.

Use the ASYNC redo transport mode for minimal impact on the primary database, but with a lower degree of synchronization. Optimize network throughput following the best practices described in Section 9. Oracle recommends that you conduct a performance assessment with your proposed network configuration and current, or anticipated, peak redo rate. The network effect between the primary and standby databases, and the effect on the primary database throughput must be understood. Because the network between the primary and standby databases is essential for the two databases to remain configuring active data guard oracle 11g, the infrastructure must have the following characteristics:.

If using the SYNC transport, then minimal latency is necessary to reduce the performance impact on the primary database. In configurations that use a dedicated network connection the required bandwidth is determined by the maximum redo rate of the primary database and the efficiency of the network.

Depending on the data protection mode, there are other recommended practices and performance considerations. Maximum protection mode and maximum availability mode require SYNC transport. Distance and network configuration directly influence latency, while high latency can configuring active data guard oracle 11g the potential transaction throughput and quicken response time.

The network configuration, number of repeaters, the overhead of protocol conversions, and the number of routers also affect the overall network latency and transaction response time. You can perform all Data Guard management operations locally or remotely through the Oracle Data Guard broker's easy-to-use interfaces: The broker's interfaces improve usability and centralize management and monitoring of the Data Guard configuration.

Available as a feature of the Enterprise Edition and Personal Edition of the Oracle database, the broker is also integrated with the Oracle database and Oracle Enterprise Manager. Oracle recommends that you use the Recovery Manager RMAN utility to simplify the process of creating a physical standby database.

You can either create a standby database from backups of your primary database, or create a standby database over the network:. You can use any backup copy of the primary database to create the physical project standard 2013 trial database if the necessary archived redo log files to completely recover the database are accessible by the server session on the standby host.

RMAN copies the configuring active data guard oracle 11g files directly from the primary database to the standby database. Configuring active data guard oracle 11g primary database must be mounted or open. You must choose configuring active data guard oracle 11g active and backup-based sada te hai peer ali mp3. Creating a standby database over the network is advantageous because:.

You can transfer redo data directly to the remote host over the network without first having to go through the steps of performing a backup on the primary database. Restoration requires multiple steps including storing the backup locally on the primary database, transferring the backup over the network, storing configuring active data guard oracle 11g backup locally on the standby database, and then restoring the backup on the standby database.

With active duplication you can backup a database as it is running from Oracle ASM, and restore the backup to a host over the network and place the files directly into Oracle ASM. Before this feature, restoration required you to backup the primary and copy the backup files on the primary host file system, transfer the backup files over the network, place the backup files on the standby host file system, and then restore the files into Oracle ASM.

Enable Flashback Database on both the primary and standby database so that, in case the original primary database has not been damaged, you can reinstate the original primary database as a new standby database following a failover.

If there is a failure during the switchover process, then it can easily be reversed when Flashback Database is enabled. For more information, see Section 5. If this is not possible because you require the load performance with NOLOGGING operations, then you must ensure that the corresponding physical standby data files are subsequently synchronized.

To synchronize the physical standby data files, either apply an incremental backup created from the primary database or replace the affected standby data files with a backup of the primary data files taken after the nologging operation.

Before the file transfer, you must stop Redo Apply on the physical standby database. All of the following items are handled automatically when Oracle Data Guard broker is managing a configuration.

Table Archiving Recommendations. Maintaining a standby database requires that you bagger simulator 2012 kostenlos vollversion and start archiving on the primary database, as follows:.

Archiving must also be enabled on the standby database to support role transitions. To enable archiving on the standby database:. For example: Perform remote archiving to only one standby instance and node for each Oracle RAC standby database. All primary database instances archive to one standby destination, using the same net service name.

Oracle Net Services connect-time failover is used to automatically switch to the "secondary" standby host when the "primary" standby instance has an outage. If the archives are accessible from all nodes because Oracle ASM or some other shared file system is being used for the fast recovery area, then remote archiving can be spread across the different nodes of an Oracle RAC standby database.

This simplifies switchovers and failovers by removing the need to enable and disable the role-specific parameter files after a role transition. The following example illustrates the recommended initialization parameters for a primary database communicating to a physical standby database.

The fast recovery area must be accessible to any node within the cluster and use a shared file system technology such as automatic storage management Oracle ASMa cluster file system, a global file system, or high availability network file system HA NFS.

You can also mount the file system manually to any node within the cluster very quickly. This is necessary for recovery because all archived redo log files must be accessible on all nodes.

On the standby database nodes, recovery from a different node is required when a failure occurs on the node applying redo and the apply service cannot be restarted. In that case, any of the existing standby instances residing on a different node can initiate managed recovery. In the worst case, when the standby archived redo log files are inaccessible, the managed recovery process MRP on the different node fetches the archived redo log files using the FAL server to retrieve from the primary node directly.

When configuring hardware vendor shared file system technology, verify the performance and availability implications. Investigate the following issues before adopting this strategy:.

You should configure standby redo logs on all primary and standby databases for improved availability and performance.



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